whirlybird

1. Maples make those little whirlybird seeds you see spiraling down in droves each spring.
   每到春天你都能看见大量的枫树种子像一架架小小的直升机盘旋而下。

noun

1. an aircraft without wings that obtains its lift from the rotation of overhead blades

   Synonym:    helicopterchoppereggbeater